Photographic recording material comprising leuco dye for cold silver image tone

A photographic recording material comprising a silver halide emulsion layer and a leuco compounds which, upon photographic processing, is capable of generating in an imagewise manner a blue tone in developed silver images wherein the leuco dye has the structural formula:

• ##STR4## wherein:
• R.sup.1 is an unsubstituted or a substituted aliphatic group having from 1 to about 20 carbon atoms;
• R.sup.2 is hydrogen;
• an unsubstituted or a substituted, straight or branched chain alkyl group having from 1 to about 10 carbon atoms;
• an unsubstituted or a substituted cycloalkyl group having from 3 to about 8 carbon atoms in the ring;
• or an aryl group having from 6 to about 10 carbon atoms;
• R.sup.3 is hydrogen;
• an unsubstituted or a substituted alky group having from 1 to about 10 carbon atoms;
• an unsubstituted or a substituted aryl group having from 6 to about 10 carbon atoms;
• an unsubstituted or a substituted cycloalkyl group having from 3 to about 8 carbon atoms in the ring;
• nitro;
• or cyano;
• R.sup.4 is as defined for R.sup.3 , or R.sup.4 can be hydroxy, sulfo or carboxy;
• R.sup.5 is hydroxylalkyl;
• alkylsulfonamidoalkyl;
• alkoxyalkyl;
• or alkylsulfonic acid wherein the akyl or alkoxy group has from 1 to about 12 carbon atoms or an aryl group having from 6 to about 10 carbon atoms;
• R.sup.6 is as defined for R.sup.5 ;
• R.sup.7 is hydrogen, alkyl, alkoxy, sulfoalkoxy or sulfoaryl;
• and
• R.sup.8 as defined for R.sup.7.